[bittorrent] pex questions

Alan McGovern alan.mcgovern at gmail.com
Thu Dec 4 13:14:31 EST 2008

The problem with PEX is that unless you prefer peers gotten from
trackers, new peers will find it hard to start downloading as other
clients will fill themselves up via PEX, which only gives info about
peers already in the swarm, not ones trying to enter it.


On Thu, Dec 4, 2008 at 5:46 PM, Peng Wang <pengvvang at gmail.com> wrote:
> Hello,
> I am kind of new to bittorrent and trying to understand Peer exchange (PEX).
> But all I can find are wiki pages. They are good starting points, but not
> very detailed. Does anybody know any study about PEX to answer questions
> like: how much load on the tracker can be reduced by PEX? With the help of
> PEX, can we choose a longer announce interval? etc.
> The PEX wiki page says: "... For this reason, careful PEX implementation to
> prefer peer lists from trackers is strongly encouraged." Is it possible that
> peers always get enough peers from PEX, so they do not query the tracker
> much, hence resulting in disconnected subgraphs (or a connected graph with
> small cuts)?
> Greatly appreciated If anyone could point me to any papers, simulation
> results, etc!
> Best,
> Peng
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